main {
    overflow: hidden;
    position: relative;
    padding: 100px 0;
    display: flex;
    align-items: center;
    min-height: 100vh;
}

main::after {
    content: "";
    position: absolute;
    width: 100%;
    height: 100%;
    top: 0px;
    left: 0px;
    z-index: 2;
    background: rgba(0, 0, 0, 0.8);
}

main .container {
    position: relative;
    z-index: 5;
}